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<pre><code>CLion&#x9879;&#x76EE;&#x6587;&#x4EF6;&#x4F4D;&#x4E8E; samples\texture\draw_cube_compress_texture
</code></pre><p>&#x524D;&#x9762;&#x4E86;&#x89E3;&#x4E86;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x7684;&#x4F18;&#x52BF;&#xFF0C;&#x4EE5;&#x53CA;&#x5236;&#x4F5C;&#x4E86;&#x7EB9;&#x7406;&#x538B;&#x7F29;&#x7684;&#x5DE5;&#x5177;&#xFF0C;&#x8FD9;&#x4E00;&#x8282;&#x5C31;&#x52A0;&#x8F7D; &#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6587;&#x4EF6; <code>urban.cpt</code>&#x8FDB;&#x884C;&#x6E32;&#x67D3;&#x3002;</p>
<h3 id="1-&#x52A0;&#x8F7D;cpt&#x6587;&#x4EF6;"><a name="1-&#x52A0;&#x8F7D;cpt&#x6587;&#x4EF6;" class="anchor-navigation-ex-anchor" href="#1-&#x52A0;&#x8F7D;cpt&#x6587;&#x4EF6;"><i class="fa fa-link" aria-hidden="true"></i></a>1. &#x52A0;&#x8F7D;cpt&#x6587;&#x4EF6;</h3>
<p>&#x4E4B;&#x524D;&#x9879;&#x76EE;&#x4E2D;&#x4F7F;&#x7528;&#x7684;&#x662F;<code>.jpg</code>&#x56FE;&#x7247;&#xFF0C;<code>.jpg</code>&#x56FE;&#x7247;&#x5E76;&#x4E0D;&#x662F;GPU&#x652F;&#x6301;&#x7684;&#x683C;&#x5F0F;&#xFF0C;&#x9700;&#x8981;&#x501F;&#x52A9;<code>stb_image</code>&#x8FD9;&#x4E2A;&#x5E93;&#xFF0C;&#x5728;CPU&#x4E2D;&#x8FDB;&#x884C;&#x89E3;&#x6790;&#x5F97;&#x5230;RGB&#x6570;&#x636E;&#xFF0C;&#x518D;&#x4E0A;&#x4F20;&#x5230;GPU&#x3002;
&#x672C;&#x8282;&#x8981;&#x4F7F;&#x7528;&#x7684;<code>.cpt</code>&#x6587;&#x4EF6;&#xFF0C;&#x6570;&#x636E;&#x662F;&#x4ECE;GPU&#x4E0B;&#x8F7D;&#x4FDD;&#x5B58;&#x7684;&#xFF0C;&#x662F;GPU&#x652F;&#x6301;&#x7684;&#x683C;&#x5F0F;&#xFF0C;&#x6240;&#x4EE5;&#x5C31;&#x4E0D;&#x9700;&#x8981;&#x518D;&#x4F7F;&#x7528;<code>stb_image</code>&#x4E86;&#xFF0C;&#x539F;&#x6765;&#x7684;&#x52A0;&#x8F7D;&#x6D41;&#x7A0B;&#x4E5F;&#x9700;&#x8981;&#x4FEE;&#x6539;&#x3002;</p>
<p>&#x4FEE;&#x6539;<code>Texture2D::LoadFromFile</code>&#xFF0C;&#x4F7F;&#x7528; C++ &#x6807;&#x51C6;&#x5E93;&#x8BFB;&#x53D6;<code>.cpt</code>&#x6587;&#x4EF6;&#xFF1A;</p>
<pre><code class="lang-c++">Texture2D* Texture2D::LoadFromFile(<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; image_file_path)
{
    Texture2D* texture2d=<span class="hljs-keyword">new</span> Texture2D();

    StopWatch stopwatch;
    stopwatch.start();

        <span class="hljs-comment">//&#x8BFB;&#x53D6; cpt &#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6587;&#x4EF6;</span>
        <span class="hljs-function">ifstream <span class="hljs-title">input_file_stream</span><span class="hljs-params">(image_file_path,ios::in | ios::binary)</span></span>;
        TpcFileHead tcp_file_head;
        input_file_stream.read((<span class="hljs-keyword">char</span>*)&amp;tcp_file_head,<span class="hljs-keyword">sizeof</span>(TpcFileHead));

        <span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">char</span>* data =(<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">char</span>*)<span class="hljs-built_in">malloc</span>(tcp_file_head.compress_size_);
        input_file_stream.read((<span class="hljs-keyword">char</span>*)data,tcp_file_head.compress_size_);
        input_file_stream.close();

    stopwatch.stop();
    <span class="hljs-built_in">std</span>::<span class="hljs-keyword">int64_t</span> decompress_jpg_cost = stopwatch.milliseconds();

    texture2d-&gt;gl_texture_format_=tcp_file_head.gl_texture_format_;
    texture2d-&gt;width_=tcp_file_head.width_;
    texture2d-&gt;height_=tcp_file_head.height_;

    <span class="hljs-keyword">delete</span> (data);

    <span class="hljs-keyword">return</span> texture2d;
}
</code></pre>
<p>&#x5728;<code>main.cpp</code> &#x4FEE;&#x6539;&#x8BFB;&#x53D6;&#x6587;&#x4EF6;&#x4E3A;<code>urban.cpt</code>&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">(<span class="hljs-keyword">void</span>)</span>
</span>{
    init_opengl();

    CreateTexture(<span class="hljs-string">&quot;../data/images/urban.cpt&quot;</span>);

    ......
}
</code></pre>
<p>&#x8C03;&#x8BD5;&#x67E5;&#x770B;&#x6570;&#x636E;&#xFF1A;
<a href="../../imgs/texture_make_beautiful/draw_cube_compress_texture/load_cpt_success.jpg" data-lightbox="d3cb3f6f-62fc-458b-bba6-315dfedacbb3" data-title=""><img src="../../imgs/texture_make_beautiful/draw_cube_compress_texture/load_cpt_success.jpg" alt=""></a></p>
<p>&#x6B63;&#x5E38;&#x8BFB;&#x53D6;&#x5230;cpt&#x6587;&#x4EF6;&#x5934;&#x4FE1;&#x606F;&#xFF0C;&#x800C;&#x4E14;&#x89E3;&#x6790;cpt&#x6587;&#x4EF6;&#x8017;&#x65F6;&#x4EC5;6ms&#xFF01;</p>
<h3 id="2-&#x4E0A;&#x4F20;cpt&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x5E76;&#x6E32;&#x67D3;"><a name="2-&#x4E0A;&#x4F20;cpt&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x5E76;&#x6E32;&#x67D3;" class="anchor-navigation-ex-anchor" href="#2-&#x4E0A;&#x4F20;cpt&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x5E76;&#x6E32;&#x67D3;"><i class="fa fa-link" aria-hidden="true"></i></a>2. &#x4E0A;&#x4F20;cpt&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x5E76;&#x6E32;&#x67D3;</h3>
<p>&#x4ECE;cpt&#x6587;&#x4EF6;&#x8BFB;&#x53D6;&#x5230;&#x6587;&#x4EF6;&#x5934;&#x548C;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4E4B;&#x540E;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x4E0A;&#x4F20;&#x5230;GPU&#x8FDB;&#x884C;&#x6E32;&#x67D3;&#x3002;</p>
<pre><code class="lang-c++">Texture2D* Texture2D::LoadFromFile(<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; image_file_path)
{
    ......

    <span class="hljs-comment">//1. &#x901A;&#x77E5;&#x663E;&#x5361;&#x521B;&#x5EFA;&#x7EB9;&#x7406;&#x5BF9;&#x8C61;&#xFF0C;&#x8FD4;&#x56DE;&#x53E5;&#x67C4;;</span>
    glGenTextures(<span class="hljs-number">1</span>, &amp;(texture2d-&gt;gl_texture_id_));

    <span class="hljs-comment">//2. &#x5C06;&#x7EB9;&#x7406;&#x7ED1;&#x5B9A;&#x5230;&#x7279;&#x5B9A;&#x7EB9;&#x7406;&#x76EE;&#x6807;;</span>
    glBindTexture(GL_TEXTURE_2D, texture2d-&gt;gl_texture_id_);

    stopwatch.restart();
    {
        <span class="hljs-comment">//3. &#x5C06;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4E0A;&#x4F20;&#x5230;GPU;</span>
        glCompressedTexImage2D(GL_TEXTURE_2D, <span class="hljs-number">0</span>,  texture2d-&gt;gl_texture_format_, texture2d-&gt;width_, texture2d-&gt;height_, <span class="hljs-number">0</span>, tcp_file_head.compress_size_, data);
    }
    stopwatch.stop();
    <span class="hljs-built_in">std</span>::<span class="hljs-keyword">int64_t</span> upload_cpt_cost = stopwatch.milliseconds();

    <span class="hljs-comment">//4. &#x6307;&#x5B9A;&#x653E;&#x5927;&#xFF0C;&#x7F29;&#x5C0F;&#x6EE4;&#x6CE2;&#x65B9;&#x5F0F;&#xFF0C;&#x7EBF;&#x6027;&#x6EE4;&#x6CE2;&#xFF0C;&#x5373;&#x653E;&#x5927;&#x7F29;&#x5C0F;&#x7684;&#x63D2;&#x503C;&#x65B9;&#x5F0F;;</span>
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    <span class="hljs-keyword">delete</span> (data);

    <span class="hljs-keyword">return</span> texture2d;
}
</code></pre>
<p>&#x548C;&#x4E4B;&#x524D;&#x4F7F;&#x7528;<code>.jpg</code>&#x56FE;&#x7247;&#x7C7B;&#x4F3C;&#xFF0C;&#x552F;&#x4E00;&#x4E0D;&#x540C;&#x7684;&#x662F;&#xFF0C;&#x8FD9;&#x6B21;&#x6211;&#x4EEC;&#x4E0A;&#x4F20;&#x7684;&#x662F;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#xFF0C;&#x9700;&#x8981;&#x4F7F;&#x7528;&#x65B0;&#x7684;API&#xFF1A;<code>glCompressedTexImage2D</code>&#xFF0C;&#x4E0B;&#x9762;&#x770B;&#x4ECB;&#x7ECD;&#x3002;</p>
<pre><code class="lang-c++"><span class="hljs-comment">/** 
 * @brief &#x5C06;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4E0A;&#x4F20;&#x5230;GPU;
 * @param target    &#x76EE;&#x6807;&#x7EB9;&#x7406;&#xFF0C;GL_TEXTURE_2D(2D&#x7EB9;&#x7406;)
 * @param level     &#x5F53;&#x56FE;&#x7247;&#x6570;&#x636E;&#x662F;&#x5305;&#x542B;&#x591A;&#x4E2A;mipmap&#x5C42;&#x7EA7;&#x65F6;&#xFF0C;&#x6307;&#x5B9A;&#x4F7F;&#x7528;mipmap&#x5C42;&#x7EA7;&#x3002;
 * @param internalformat &#x4E0A;&#x4F20;&#x7684;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x683C;&#x5F0F;
 * @param width
 * @param height
 * @param border
 * @param imageSize &#x4E0A;&#x4F20;&#x7684;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x5B57;&#x8282;&#x6570;
 * @param data &#x4E0A;&#x4F20;&#x7684;&#x6570;&#x636E;
 * @return
 */</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">glCompressedTexImage2D</span><span class="hljs-params">(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, <span class="hljs-keyword">const</span> <span class="hljs-keyword">void</span> * data)</span></span>;
</code></pre>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F; <code>internalformat</code>&#xFF0C;&#x4E00;&#x5B9A;&#x8981;&#x548C;&#x56FE;&#x7247;&#x538B;&#x7F29;&#x540E;OpenGL&#x8FD4;&#x56DE;&#x7684;&#x538B;&#x7F29;&#x683C;&#x5F0F;&#x4FDD;&#x6301;&#x4E00;&#x81F4;&#xFF0C;&#x4E0D;&#x7136;&#x4F1A;&#x51FA;&#x73B0;&#x9519;&#x8BEF;&#x3002;</p>
<p>&#x7F16;&#x8BD1;&#x8FD0;&#x884C;&#xFF0C;&#x6B63;&#x5E38;&#x6E32;&#x67D3;&#x4E86;&#x7ACB;&#x65B9;&#x4F53;&#xFF1A;
<a href="../../imgs/texture_make_beautiful/draw_cube_compress_texture/draw_success.jpg" data-lightbox="33730166-4d65-422f-96db-0001a859b7af" data-title=""><img src="../../imgs/texture_make_beautiful/draw_cube_compress_texture/draw_success.jpg" alt=""></a></p>
<h3 id="3-&#x6027;&#x80FD;&#x63D0;&#x5347;&#x5BF9;&#x6BD4;"><a name="3-&#x6027;&#x80FD;&#x63D0;&#x5347;&#x5BF9;&#x6BD4;" class="anchor-navigation-ex-anchor" href="#3-&#x6027;&#x80FD;&#x63D0;&#x5347;&#x5BF9;&#x6BD4;"><i class="fa fa-link" aria-hidden="true"></i></a>3. &#x6027;&#x80FD;&#x63D0;&#x5347;&#x5BF9;&#x6BD4;</h3>
<p>&#x65AD;&#x70B9;&#x8C03;&#x8BD5;&#x67E5;&#x770B;&#x8017;&#x65F6;&#xFF0C;&#x5982;&#x56FE;:
<a href="../../imgs/texture_make_beautiful/draw_cube_compress_texture/load_and_upload_fast.jpg" data-lightbox="0262a22d-337c-4c8a-8fab-56ebbb42d92d" data-title=""><img src="../../imgs/texture_make_beautiful/draw_cube_compress_texture/load_and_upload_fast.jpg" alt=""></a></p>
<p>&#x4E0E;&#x4F7F;&#x7528;<code>.jpg</code>&#x6587;&#x4EF6;&#x8FDB;&#x884C;&#x5BF9;&#x6BD4;&#xFF1A;</p>
<table>
<tbody><tr bgcolor="AliceBlue"><td><b></b></td><td><b>&#x89E3;&#x6790;&#x8017;&#x65F6;(ms)</b></td><td><b>&#x4E0A;&#x4F20;&#x8017;&#x65F6;(ms)</b></td></tr>
<tr><td bgcolor="#FFFFCC">jpg</td><td>1571</td><td>960</td></tr>
<tr><td bgcolor="#FFFFCC">cpt</td><td>4</td><td>16</td></tr>
</tbody></table>

<p>&#x6709;&#x5F88;&#x5927;&#x7684;&#x6027;&#x80FD;&#x63D0;&#x5347;&#x3002;</p>
<p>&#x56DE;&#x987E;&#x4E00;&#x4E0B;&#xFF0C;&#x6211;&#x4EEC;&#x662F;&#x5148;&#x5C06;<code>.jpg</code>&#x56FE;&#x7247;&#xFF0C;&#x89E3;&#x6790;&#x5F97;&#x5230;RGB&#x6570;&#x636E;&#xFF0C;&#x4E0A;&#x4F20;&#x5230;GPU&#x8FDB;&#x884C;&#x538B;&#x7F29;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x4ECE;GPU&#x4E0B;&#x8F7D;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#xFF0C;&#x4FDD;&#x5B58;&#x4E3A;<code>.cpt</code>&#x6587;&#x4EF6;&#x3002;</p>
<p>&#x8FD9;&#x5176;&#x5B9E;&#x5C31;&#x662F;Unity&#x5BFC;&#x5165;&#x56FE;&#x7247;&#x7684;&#x65F6;&#x5019;&#x5E72;&#x7684;&#x6D3B;&#xFF0C;&#x73B0;&#x5728;&#x4F60;&#x77E5;&#x9053;&#x4E3A;&#x4EC0;&#x4E48;Unity&#x5BFC;&#x5165;&#x56FE;&#x7247;&#x90A3;&#x4E48;&#x6162;&#x4E86;&#xFF01; </p>
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